<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BXT-P/APL] Low performance on UI, even without graphic interface" href="https://bugs.freedesktop.org/show_bug.cgi?id=93797#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - [BXT-P/APL] Low performance on UI, even without graphic interface" href="https://bugs.freedesktop.org/show_bug.cgi?id=93797">bug 93797</a> from <a class="email" href="mailto:imre.deak@intel.com" title="Imre Deak <imre.deak@intel.com>"> Imre Deak</a> <pre>(In reply to Imre Deak from <a href="show_bug.cgi?id=93797#c12">comment #12</a>) > (In reply to Imre Deak from <a href="show_bug.cgi?id=93797#c11">comment #11</a>) > > (In reply to Elio from <a href="show_bug.cgi?id=93797#c10">comment #10</a>) > > > Sure, in the middle time in setting maxcpus in grub with 1 and it looks a > > > lot better. > > > > Ok, I can confirm this, I can see it on my system as well now. This started > > to happen when I upgraded to the BIOS I suggested to you in <a href="show_bug.cgi?id=93797#c9">comment#9</a>, so > > probably that won't solve your problem. Booting with maxcpus=1 gets rid of > > the issue for me too. I will try now different BIOS versions to see which > > one is the latest that works. > > > > Meanwhile this isn't a graphics driver issue, I can see the problem even if > > I don't start the graphical interface, just by trying to type something on > > the text console. I notified already the core people (Mika Westerberg), he > > promised to take a look at this. > > One more thing I noticed that this is somehow related to GFX RC6 state. If > we disable that via BIOS (Uncore/Render:C6 disable, GT PM: disable) or by > booting with i915.enable_rc6=0 then we also don't have the problem. I assume > entering RC6 would enable some deeper CPU/system level power state, which > could cause this lag. Two other BIOS setup options under 'CPU Configuration'/'CPU Power Management' to get rid of the lag (either one alone gets rid of the lag while having the above RC6 and GT PM options enabled): 1. Max Core C State: 'Fused value'->'Core C6' 2. Max Package C State: 'S0ix default' -> 'C0'/'PC2'</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>